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2140 when all bitcoin (20.99999998 million) will have been issued. After 2140, no new bitcoins will be issued. Bitcoin miners also earn fees from transactions. Every transaction may include a trans‐ action fee, in the form of a surplus of bitcoin between the transaction’s inputs and out‐ puts. The winning bitcoin miner gets to “keep the change” on the transactions included in the winning block. Today, the fees represent 0.5% or less of a bitcoin miner’s income, the vast majority coming from the newly minted bitcoins. However, as the reward de‐ creases over time and the number of transactions per block increases, a greater pro‐ portion of bitcoin mining earnings will come from fees. After 2140, all bitcoin miner earnings will be in the form of transaction fees. The word “mining” is somewhat misleading. By evoking the extraction of precious metals, it focuses our attention on the reward for mining, the new bitcoins in each block. While mining is incentivized by this reward, the primary purpose of mining is not the reward or the generation of new coins. If you view mining only as the process by which coins are created you are mistaking the means (incentives) as a goal of the process. Mining is the main process of the de-centralized clearinghouse, by which transactions are validated and cleared. Mining secures the bitcoin system and enables the emergence of network-wide consensus without a central authority. Mining is the invention that makes bitcoin special, a de-centralized security mechanism that is the basis for peer-to-peer digital cash. The reward of newly minted coins and transaction fees is an incentive scheme that aligns the actions of miners with the security of the network, while simultaneously implementing the monetary supply. In this chapter, we will first examine mining as a monetary supply mechanism and then look at the most important function of mining, the de-centralized emergent consensus mechanism that underpins bitcoin’s security. Bitcoin Economics and Currency Creation Bitcoins are “minted” during the creation of each block at a fixed and diminishing rate. Each block, generated on average every 10 minutes, contains entirely new bitcoins, created from nothing. Every 210,000 blocks or approximately every four years the cur‐ rency issuance rate is decreased by 50%. For the first four years of operation of the network, each block contained 50 new bitcoin. In November of 2012, the new bitcoin issuance rate was decreased to 25 bitcoin per block and it will decrease again to 12.5 bitcoin at block 420,000, which will be mined sometime in 2016. The rate of new coins decreases like this exponentially over 64 “halv‐ ings”, until block 13,230,000 (mined approximately in year 2137) when it reaches the minimum currency unit of 1 satoshi. Finally, after 13.44 million blocks, in approximately 2140, all 2,099,999,997,690,000 satoshis, or almost 21 million bitcoin will be issued. 178 | Chapter 8: Mining and ConsensusPDF Image | Mastering Bitcoin
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